These cover the generic procedures for the ultrasonic examination of both ferritic and austenitic pipe welds. The blocks offer users an economical alternative to fabricating multiple curved cal blocks (pipe sections) in many diameters and wall thicknesses. The blocks are normally supplied in sets of 3 individual blocks; one in A516 Grade 70 Steel, one in Type 304/304L Stainless Steel, and one in Type 316/316L Stainless Steel. Individual blocks of any one alloy are also offered.